<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Home</title>
    <style>
        body {
            background-color: #333; /* 灰黑色背景 */
            color: white;           /* 白色文字 */
            display: flex;
            justify-content: center;
            align-items: center;
            height: 100vh;
            margin: 0;
        }

        h1 {
            font-size: 3em;
        }
    </style>
</head>
<body>
<h1>Spring Security 实战 Demo</h1>
</body>
</html>
